Package-Applet

**miriyalasrihari** · May 16th, 2012 01:44 AM

hi guys, i am newbie, i have following code

AppletOne.java

[Code]
import java.sql.*;
import javax.swing.*;
import Package_DB.*;

public class AppletOne extends JApplet {

/**
*
*/
private static final long serialVersionUID = 1L;
private Connection connection;
ConnectToDB objConnectToDB = new ConnectToDB();

public void init() {
GetData();
}

private void GetData() {
try {
connection = objConnectToDB.GetConnection("localhost:3306", "test",
"root", "root@123");
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

String listOfNames = "";
try {
listOfNames = GetaDataFromMySQLDataBase();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JOptionPane.showMessageDialog(null, listOfNames);
}

private String GetaDataFromMySQLDataBase() throws SQLException {
String query = "SELECT * FROM test.test";
String listOfNames = objConnectToDB.GetDataAsString(connection, query);
return listOfNames;
}
}
[Code]

and

a package

[Code]
package Package_DB;

import java.sql.*;

public class ConnectToDB {
private Connection connection;

public static void main(String args[]) {
System.out.print("asdasd");
// JOptionPane.showMessageDialog(null,"listOfNames");
}

public Connection GetConnection(String server, String database,
String userName, String password) throws InstantiationException,
Exception, Throwable {

try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection("jdbc:mysql://" + server
+ "/" + database + "?user=" + userName + "&password="
+ password);
return connection;
} catch (SQLException e) {
// return e.getMessage();
return connection;
}

}

public String GetDataAsString(Connection connection, String query)
throws SQLException {
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery(query);
String lastName = "";
while (rs.next()) {
lastName += rs.getString("Name") + ",";
}
rs.close();
return lastName;
}
}

[Code]

while running in a eclipse, i got the data from mySQL database.. but in through command prompt i am getting following error

C:\Users\Srihari\workspace\exp1\src>javac AppletOne.java

C:\Users\Srihari\workspace\exp1\src>java AppletOne
Exception in thread "main" java.lang.NoSuchMethodError: main

C:\Users\Srihari\workspace\exp1\src>

and

C:\Users\Srihari\workspace\exp1\src>appletviewer AppletOne.html
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at Package_DB.ConnectToDB.GetConnection(ConnectToDB.java:18)
at AppletOne.GetData(AppletOne.java:20)
at AppletOne.init(AppletOne.java:15)
at sun.applet.AppletPanel.run(AppletPanel.java:424)
at java.lang.Thread.run(Thread.java:662)
java.lang.NullPointerException
at Package_DB.ConnectToDB.GetDataAsString(ConnectToDB.java:32)
at AppletOne.GetaDataFromMySQLDataBase(AppletOne.java:45)
at AppletOne.GetData(AppletOne.java:35)
at AppletOne.init(AppletOne.java:15)
at sun.applet.AppletPanel.run(AppletPanel.java:424)
at java.lang.Thread.run(Thread.java:662)

C:\Users\Srihari\workspace\exp1\src>

and my html page look like

<html>
<applet code="AppletOne.class" width="500" height="200"></applet>
</applet>
</html>

i 've windows7 OS and 've only java path..

but in eclipse i added mysql-connector-java-5.1.6.jar as reference..

please help me in this...

**keang** · May 16th, 2012 11:10 AM

while running in a eclipse, i got the data from mySQL database.. but in through command prompt i am getting following error

It's an applet, to run it as an applet you need to run it from a browser or appletviewer. Also you can't run it from the command line as is as there's no main method.

and my html page look like

You are missing the archive attribute to specify the name of the mysql-connector-java-5.1.6.jar.

Look at this guide: http://www.cs.wcupa.edu/~rkline/java/applets.html

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